脊神经根共硬脊膜鞘较少见。作者在解剖成年尸体86具(男67,女19)中遇见2例,现报道如下:2例均为男性右侧,左侧正常,在 L_4神经根以上,左右两侧硬脊膜鞘的发出水平基本与同节段椎骨的椎弓根一致。左侧 L_5神经根硬脊膜鞘在 L4～5椎间盘水平发出,S_1神经根在 L_5S_1椎间盘上缘发出。但右侧 L_5神经根硬脊膜鞘起点比左侧低约2cm,且比左侧粗 Spinal nerve root a total of dural sheath less common. The author in the anatomical adult corpse 86 (male 67, female 19) met in 2 cases, are reported as follows: 2 cases were male right, left normal, above the L4 nerve root, left and right sides of the dural sheath issued The basic level with the same segment of the vertebral pedicle consistent. Left L5 nerve root dura sheath in the L4 ~ 5 disc level issue, S 1 nerve root in L_5S_1 disc issued on the edge of the edge. However, the right L_5 nerve root dura sheath sheath starting point lower than the left about 2cm, and thicker than the left